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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9d6a43f4c3b900f1e578ef87b2c3df91831cf03b69d2f00989bdb41f02b9b8' 
  AND token = '8bIzg20NWHJR3G1Asa4p1S+ZG3ioEytc9ZHh1WlD9/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}